Iranian President Hassan Rouhani speaks during a address and discussion hosted by the Asia Society and the Council on Foreign Relations at the Hilton Hotel in midtown Manhattan.

Written by

Oren Dorell
USA Today

Iran could produce enough weapons-grade uranium to build a nuclear bomb in as little as a month, according to a new estimate by one of the USA's top nuclear experts.

The new assessment comes as the White House invited Senate staffers to a briefing on negotiations with Iran as it is trying to persuade Congress not to go ahead with a bill to stiffen sanctions against Iran.

"Shortening breakout times have implications for any negotiation with Iran," stated the report by of the Institute for Science and International Security. "An essential finding is that they are currently too short and ...